Drill.



W. P. TRUTTBR.

DRILL.

APPLIGATIDN FILED SEPT.

with asno 5 jim-@Wie UNITED STATES PATENT FIIICE.

WALTER F. TRDTTER, OF CHARLESTON, WEST VIRGINIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE JEFFREY MANUFACTURING COMPANY, A CORPORATION OF OHIO.

DRILL.

Specification of Letters Patent.

Patented Fel. 10,1914.

` To all whom it may concern sts Be it known that I, IVALTER F. Tno'T'r-nn,

a citizen of the United States, residing at Charleston, in the county of Kanawha and State of West Virginia, have invented cer-v tain new and useful Improvements in Drills,

vof which the following is a specification,

reference being had therein to the accompanying drawing. l

This invention relates to improvements in electric drills of the sort-used in drilling coal, rock and similar 1naterial.`

The principal object of the invention is to provide in a drill of the sort referred to an improved general arrangement of parts,

and especially an improved relationship between the feeding mechanism and the other elements.

Of th drawings, Figure 1 is a central longitudinal section of an apparatus em bodying. my invention; Fig. 2 is a section on the line 2*2 of Fig. 1, and Fig. 3 is a section on the line 3 3 of F ig. 1. Fig. 4 is a section on the line 1C- 4 of Fig. 1. Fig. 5 is an end view showing the feed nut and nut support. g

The apparatus comprises an electric motor A, the drill stem C, gearing D,//connect ing the ldrill stem with the motor, and a split nut D of well'known construct-ion, for feeding the drill and drill stem axially. However, the mounting of this feed nut is novel in some respects, and. the means com- .bined therewith for controlling its move- Referring to the parts somewhat more in detail, l is a sleeve or hub for carrying'the armature 2, the windings of which are connected to thecommutator 3 in the usual manner. The commutator brushes may be of any suitable construction and supported andarrangedin any proper way.

4, t indicate the coils of the field magnet, they being mounted upon the peripheral central part of the motor housing or casing, this casing serving to not only inclose the interior movable parts, but also providing supports for the bearings. l

The armature shaft 7 is hollow, and `has secured to itthe armature sleeve or spider 1 andthe commutator 3 and this hollow shaft is .in turn supported by the bearings 6 and 8, the latter being formed in the end Wall 8a of the motor casing, and the former being supported upon a )vcb or partition wall at the opposite end of the motor casing. The interior of the housing as a whole is divided into two coniparlments. by this web or wall 25, one compartment eontaining the gearing andthe other the motor. This web or wall 25 also cai-.ries an annular oil receptacle QG in which.I is dolleced any oil that escapes from the bearing or which may otherwise come from the arinature shaft. An oil throwing shell 27 is secured Ato the shaft, it extending beyond the windings of the 'armature so that the latter are fully. protected from oil, the latter having as is wellktmwn, deleterious effect upon the windings when it comes in contact" with them. l

Fixed to the armature shaftl' upon the opposite side of the web from the motor is a head 9 in which are carried the gears for communicating motion to thc-drill stem. In this instance these gears are shown as 10, 11, 12 and 13. A10 and l1 are secured to each other so that Ythey turn together about the axis of the pin 14 which is supported by the head 9 and the gears 12 and pinl. The gears 10 and 12 mesh with a fixed gear 16 which is'securcd tothe frame of the apparatus while thelgearsgll and 13 I mesh with a gear 17 secured to a sleeve 1S y,frotatably-mounted in thebushing 50 within the frame.

When the' head 9 turns with the armature shaft, the gears 10 and 12 will ;bc turned about their axes by reason of their engagement with the stationary gear 1G, and that their connected gears 11 and 13 will be rotated thereby imparting movement to the gear 17 and the sleeve 18. It will further be seen that by arranging the various gears with the proper number of gear teeth in a manner as is well understood, any desired ratio of revo-lution of the sleeve 18 to those of the armature shaft may be secured. p

Secured to the sleeve 18 are longitudinally ldrill stem C so that the drill stemv is carlongitudinal movement is permitted, the stem extending through the hollow armature shaft. The working point of the drill When the armature revolves its motion is 13 are similarly mounted to turn about. thel extending keys 19 which enter slots in thev is at the end of shaft opposite to the motor. y

transmitted through the gears on the head.

ried by the sleeve in its rotation, but rel ative m Lees/,ose

9, and the sleeve 18 lo the stein C, and the latter engaging with the nut D will (while Y turning) be fed longitudinally7 so long as the nut is stationary. The easing 5, at the nut end, is provided with a shoulder 30, between which and a shoulder 3l upon the abiltnlent casting` 32 supporting the nut is a ball bearing 33, whereby the nut may turn upon the easing. YThe nut supporting eastingis held in proper relation to the casing by means el a radial flange 3l upon che nui; support which enters a. eorresponding greove in the easing'. i Sleeve. upon the nut Support inclos s the ball bearing, thereby protecting il and securing it in position. With these parts are combined iicLi-onally acting' devices by which the ni'i is held stationary (hiring normal V op -nalien,\l butl which permit it to rotate more er rapidly when greatresislance is experienced by ille drill'.

3G is a friction band applied to the ieriel' oli the nul support, and lxaving its ends secured to the casing'. The tension of the band may be regulated by a screw 3T. ll the 'friel'ien band has been Set sullieiently light the nm"y will be normallyheld Siaiionary and the drill 'w ill be `led :forward with its highesiA speed. int if for an;7 reason the advance el' the drill is impeded the frictional connecting devices will permit a yielding and l'he nut will turn with the Stein, thus slewing down the drill more er less without ell'eering the speed of the meter.

The inieriorl)r threaded feed-nul D" is inade in two halves 38-38. These "two parte olf the feed nutare held in engagement with the threaded drill stein b y the two sanrrounding' Supporling pieces 39 provided with semi-circular end flanges lOM-/ll which `screws Ll, g is inade in twe parle S-i8 held 'egeliher hold the feed-1' rel ai ion w ith 'l' cured te the arm of the cas" are held in contact with fe l nin. means of Jehe thuniib-eeijew lb engaglne 44 and 115 o'l' the parts The i' prevenced iroin relating relatively te clamping suppe-rte 39 hy means ef i' c v The nuhsnpporling; easli' by the bells 4:9.

'l de not herein. 'present elai te Ldie gearing` or power-iran. nil; b" i or motor parts, sneh elainieA being pre in my. applicatien, Ser. lle. December 3l, 1907.

ln a rotary drill 'the eonibinaiion of a niain frannn a roialable(lifivingjsleewelo indinallyv fixed Wih respee to lzhe niolzer connected with the sleeve, a

null)7 lined abutmenl relairanie en the Side al; which 'll d el' l'he Stein prejeeis, a niminallfv regi brake engaging lhe abnnie l and he a reinoiable split nut engaging; the en i points adjacent the :biuinent and al he Sid thereof away from the frame, and a ff connected with the abi'iln'ient and to releasably engage the nut and he, nut in engagenieni. with the sie-ni Vlined position with respect te the il iin leslin'ieny whereof. lnre, in i'nesence oli inve wiin 

